Speed micrometer



Z4- :nel

SPEED MIGROMETER Filed Sept. 13, 1944 2 Sheelts-Sheet 1 M www Patented July 2, 1946 UNITED STATES PATENT OFFICE SPEED MICROMETER.

Peter J. Jackman, New York, N. Y.

Application September 13, 1944, Serial No. 553,881

' (c1. ca -164) 6. Claims. 1

This invention relates to a micrometer.

It is particularly aimed to provide a construction which will speed up and facilitate the operation and ease of manipulation of a micrometer by bringing the measuring surfaces together or by separating them to any extent within the scope of operation.- l

It is further aimed to provide a novel structure in which there will be less pressure on the measuring surfaces, especially so that a safety frictional ratchet or stop can be eliminated or dispensed with.

It is further aimed to generally improve the construction of a micrometer, and provide one which is facile to assemble and disassemble as well as relatively inexpensive to manufacture.V

The more specific objects and advantages will become apparent from the description following taken in connection with accompanying drawings illustrating an operative embodiment.

In said drawings- Figure 1 is a side elevation of a speed micrometer constructed in accordance with the invention;

Figure 2 is a view on an enlarged scale, being taken substantially centrally through the device, with the major portion of the frame broken away;

Figure 3 is a cross section taken on the line 3-3 of Figure 2;

Figure 4 is a cross section taken on the line 4--4 of Figure 2;

Figure 5 is a detail of the central parts of Figure 1, with more of the parts shown in section to disclose details;

Figure 6 is a, cross section taken on the line 6 6 of Figure 5;

Figure 7 is a fragmentary plan view of the parts adjacent the actuator; and

Figure 8 is a cross section taken on the line 8-8 of Figure '7.

Referring specically to the drawings wherein like reference characters designate like or similar parts, I indicates a conventional frame, usually of U-shape and provided with an interior anvil as at I I.v From the frame, a tubular barrel I2 rigidly projects.

A spindle I3 is disposed concentrically of the barrel I2, having a reduced portion I4 journaled in a portion of the frame I0 as shown, and projecting into the space of the frame in alignment with the anvil II for coaction with the latter in measuring. The spindle I3 at one portion thereof, has longitudinally disposed gear teeth I4a. and adjacent its outer end has left-hand screw threads I5. Such screw threads I are enmeshed to barrel I2.

with the screw threads of a nut I6 located within the outer end of the barrel I2 and rigidly xed thereto. Outwardly of the nut I6, spindle I3 has a portion I'I rigidly connected with an external cap or sleeve I3. The spindle I3 and sleeve I8 may be integral if desired.

An actuating device in the form of a sleeve or tumbler I9 is journalled on the exterior of the barrel I2 and has one end in abutmentagainst the frame Ill. Such actuating device has an enlargement 20 provided thereon in any suitable manner. To this end, sleeve or actuating device I9 has an outwardly extending flange at 2l peripherally terminating in an inwardly extending iiange 22 which is in screw-threaded engagement with an annular wall 23 of a housing 24. Such housing 24 is journalled on an outwardly extending wall 25 of a collar 2S surrounding and rigidly secured on the barrel I2.

Barrel I2 has an opening 23 closed by and beneath which a, seat member 2l is welded or otherwise rigidly fixed on the barrel I2 for positioning of such portion. A relatively iixed pin 30 at one end extends into the opening 28 resting on seat member 2l and has a flat portion at 3I so that a set screw 32 which is screw threaded in an opening or socket in the collar 26 may extend into opening 28 be tightened against portion 3l to hold pin 30 rigidly but removably in place and also to hold collar 26 against rotation relative A set screw 33 may be threaded into openings in the wall 24 and flanges Y22 to prevent loosening of housing 20 with respect to the actuating device I9.

It will be noted that the pin 30 extends interiorly of the housing and substantially throughout its length, parallel to the spindle I3. A bushing or bearing 35 is rigidly fixed on the barrel I2, to receive one end of pin 30 and it is relatively close to Ithe flange 2I whereby the actuating device will be held against longitudinal displacement by and between the same and frame I0. In addition washers 36 are strung on the pin 30 and between the washers, a, gear or pinion 3'I is journalled on such pin 30 at 38. The teeth of the gear or pinion 38 are enmeshed with the teeth Illa of the spindle and also with teeth of an internal rack 39 formed on the Wall 24 of the housing 20. y

It will be noted that conventional or other suitable calibrations may be provided longitudinally 2,403,285 I v [j j 3 As a result ofthe construction described, Velther the housing 20 or remainder of the actuating device I9 may be manually engaged and turned in order to cause the teeth 39 to actuateY named, the cap or thimbie ls and the spindle is will close when the actuating device I9 is turned `to .the right as in the manner of the convention;-l Y

al micrometer.

Various changes may be resorted to provided i lthey fall within the spirit and scope vowf the in` vention.

I claim as my invention:

engaged by the gear, a thimble attached to the spindle surrounding one end of the barrel, and a screw connection between the spindle and barv rel.

1. A micrometer of the class describedhavingw; a frame, a barrel extending therefrom, a spindle v journaled in the frame and disposed within the lbarrel, said barrel and spindle having interengaging threaded portions, an actuating device `journaled on the barrel and including an inter- Y nal gear, said spindle having a toothed part Y forming a gear, and gearing between the actuating device and the spindle and enmeshed with the internal gear and spindle gear.

f2. A micrometer of the class described having a frame, a barrel extending therefrom, a spindle journaled in the frame and disposed within `the barrel, said spindle having a gear, an actuating device journaled on the barrel and includling a gear, gearing between the actuating device and thespindle and meshing with the gears thereof, a thimble on the barrel, and a screw lthread connection between thespindle and barlrel, said actuating device having an enlargement housing the gearing thereof.

3. A micrometer of the class described having a frame, a barrel projecting therefrom, a spindle journaled in theframe and extended through the barrel, an actuating device `journaled on the barrel, said device having an enlargement, a. gear,

means mounting the gear on the barrel within the enlargement, internal teeth on the enlargement engaged by the gear, teeth on the spindle 4. A micrometer of the class described having a frame, a barrel projecting therfrom, a spindle journaled in the frame and extended through the spindle` surrounding one end of the barrel, a

screw'co'nnection between the spindle and barrel,

said screw connection being left hand.

5. A micrometer of the class described having a frame, a barrel projecting therefrom, a, spindle'j'ournaled in the frame and extending into the barrel, an actuating-` device journaled on the barrel, said device having an enlargement, a gear, means mounting the gear on the barrel Within the enlargement, internal teeth on the enlargement engaged by the gear, teeth on the spindle engaged by the gear, a thimble attached to the spindle and surrounding one end of the barrel, said gear mounting means including a pin on the barrel extending into the enlargement, said gear being journaled on said pin, and an element on the barrel mounting one end Vof the pin and vserving as a stop to restrict longitudinal movement of the actuating device relatively to the barrel.

6. In a micrometer, a frame, a barrel project- 

